Andy started reading a 250 page book. He can read 20 pages each day. What expression represents how many pages he will have left after x days?

The expression (250 - 20 x) represents the pages he will have left after x days.

Step-by-step explanation:

Total number of pages in the book = 250

Number of books read by Andy per day = 20

⇒Number of pages read in x days = x (Number of pages read per day)

= x (20) = 20 x

So, Andy read (20 x) pages in x days.

Now, the total pages left after x days = Total pages - Pages read in x days

= 250 - (20 x)

Hence, the expression (250 - 20 x) represents the pages he will have left after x days.